AVR-Chat

Resolved.. It was a helper function that was being called to do a divide.  The math routines weren't compiled by me, and weren't compiled with debugging information, so Studio didn't know what was going on apparently.. 

Also, it was a missed optimization bug.
I'd set up to divide by a binary multiple, (32 in this case) so that the compiler using -Os would optimize that into a bit shift.  
Unfortunately it didn't.  I ended up with an explicit shift.

That was a fun exercise.